Tungsten alloy and aluminum cube set. The density contrast is sensory defying, and the set serves as a great conversation piece. Includes certificate of chemical composition and interesting facts. Machined from aerospace grade tungsten & precision alloy infused aluminum, this cube set is an excellent contemporary addition for your desk at work or side table at home. Surprise your colleagues and friends with the cubes' weight, all while they each fit in the palm of your hand. Tungsten is one of the densest naturally occurring elements, and now you can add one of nature's wonders to your own collection. If you like the cube, don't forget to check out our Tungsten Sphere.